Oral presentation

The influence of anthropogenic load on urban forest carbon dioxide fluxes assessed by eddy covariance measurements

Alexis M. Yaroslavtsev1,3,4, Joulia L. Meshalkina1,2, Ilya Mazirov1,4 & Ivan I. Vasenev1,3,4

1 Russian Timiryazev State Agrarian University, Moscow, Russia
2 Moscow Lomonosov State University, Moscow, Russia
3 RUDN University, Moscow, Russia
4 Far Eastern Federal University, Vladivostok, Russia

Modern urban forests are represented by complex mosaic of areas with wide range of anthropogenic load. RTSAU Forest Experimental Station is urban forest typical for the northern part of Moscow megalopolis. In its southern part there is a complex path network, several service buildings, small green houses, garden and forest areas, where eddy covariance tower was installed. Tower is 5 meters higher than maximum canopy level, which is about 25 meters. Forest areas significantly differ in species composition wile most of the species are deciduous ones: Quercus robur, Acer plantanoides, Tilia cordata, Betula pendula. Coniferous species are represented mainly by Pinus sylvestris and Larix decidua. In soil cover there are dominated by Sod-Podzoluvisols with thin litter (in forest area) and developed humus-accumulative horizon with mean humus content 3,24%. Analyzed here six-month carbon dioxide fluxes data (from April till October 2014) shown mean footprint diameter around 400 m with all directions evenly due to wind rose fluxes obtained from. Utilizing UAV obtained investigated territory orthophoto, area around tower was separated into sectors, according to its anthropogenic load, which was assessed as ratio of sector area under forest to the residential or manmade area. Dynamics pattern of diurnal carbon dioxide fluxes for all sectors was the same during all investigation period, except August, due to long period without precipitation. Estimated daily fluxes values were higher in sectors with lower anthropogenic load for the whole period of investigation, except August, and ranged from -2 to 8 g C CO2 d-1 m-2 with mean value at 2,5 g C CO2 d-1 m-2.






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